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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME      
Decrease (increase) in pension and other post-retirement benefits, income tax $ 1.4 $ (1.5) $ 4.7
Decrease in prior period accumulated unrealized (gain) loss, income taxes   3.5 (71.4)
Unrealized gain (loss) of the period, income tax   $ (3.5)